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The Mn-Fe negative correlation in olivines in ALHA 77257 ureiliteAn electron probe microanalyzer is used to measure the Mn, Fe, and oxygen zoning profiles of olivines in the ALHA 77257 ureilite. This is done to study the effects of reduction on the Mn-Fe value, as ureilite olivines exhibit thin reduced rims. Since the Mn content gradually increases toward the rim of ureilite olivines, while the Fa (= 100 x Fe/(Mg + Fe), mol percent) component decreases, the Mn-Fe content of olivine is likely related to redox conditions. The results of melting experiments suggest that the Mn-Fe positive correlation is related to temperature and that the negative correlation of Mn-Fe in olivine and low-Ca pyroxene is related to reduction.
Document ID
19930049219
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Miyamoto, M.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Furuta, T.
(Tokyo Univ. Japan)
Fujii, N.
(Kobe Univ. Japan)
Mckay, D. S.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Lofgren, G. E.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Duke, M. B.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 16, 2013
Publication Date
March 25, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: E3
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
93A33216
Distribution Limits
Public
Copyright
Other

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